EP2445995B1 - Scavenger compositions and their use - Google Patents
Scavenger compositions and their use Download PDFInfo
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- EP2445995B1 EP2445995B1 EP10765840.3A EP10765840A EP2445995B1 EP 2445995 B1 EP2445995 B1 EP 2445995B1 EP 10765840 A EP10765840 A EP 10765840A EP 2445995 B1 EP2445995 B1 EP 2445995B1
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- Prior art keywords
- amine oxide
- triazine
- scavenger
- mixture
- compound
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- 0 *N1CN(*)CN(*)C1 Chemical compound *N1CN(*)CN(*)C1 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G29/00—Refining of hydrocarbon oils, in the absence of hydrogen, with other chemicals
- C10G29/20—Organic compounds not containing metal atoms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/16—Hydrogen sulfides
- C01B17/167—Separation
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/80—Organic bases or salts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/06—Polluted air
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/20—Hydrogen sulfide elimination
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/20—Characteristics of the feedstock or the products
- C10G2300/201—Impurities
- C10G2300/207—Acid gases, e.g. H2S, COS, SO2, HCN
Definitions
- This invention has to do with methods and compositions for the treatment of fluids to remove or reduce hydrogen sulfide.
- H 2 S hydrogen sulfide
- hydrocarbons such as petroleum, petroleum gas and their derivatives.
- the H 2 S may be present not only in or above the hydrocarbon fluid but also in associated water, e.g. in sea water or underground water mixed with the hydrocarbon.
- H 2 S The acidity and toxicity of H 2 S necessitate its reduction to low levels.
- various processes are known and one of these is to treat the fluid or fluids concerned with a scavenger substance which reacts selectively with the H 2 S.
- a wide range of scavenger compounds is known for this purpose.
- One group of compounds of established effectiveness is the 1, 3, 5-tri-substituted hexahydrotriazines.
- the use of such triazine scavengers is disclosed in for example US 5128049 and US574 4024 .
- triazine derivative scavengers are a non-regenerable process, i.e. the scavengers are consumed in the process, it is desirable to maximise the effectiveness of the scavenger in removing H 2 S in order to minimise the cost of the procedure. It is also in any case generally desirable to improve or enhance the effectiveness of triazine derivative scavengers in removing H 2 S.
- a triazine derivative scavenger is disclosed to be used in combination with a quaternary ammonium compound to enhance its scavenging ability.
- US7264786 describes scavenging, especially for mercaptans in addition to H 2 S, using triazine derivatives substituted with tertiary amino groups, morpholines, piperazines, alkanolamines, amine oxides or polyamines.
- the aim herein is to provide new and useful methods and compositions for scavenging H 2 S from fluid bodies or fluid streams, such as those mentioned above, using a triazine scavenger.
- a particular aspect is to combine the triazine scavenger with an auxiliary substance to enhance its effectiveness, and desirably in a synergistic manner.
- a further object or aspect of the invention is the provision of a composition
- a composition comprising a triazine scavenger in admixture with a said auxiliary substance, preferably as a compatible (miscible) mixture, which can be introduced or injected as a mixture into the fluid to be treated to provide a convenient process with an appropriate predetermined ratio of the scavenger and auxiliary enhancer.
- amine oxides used in combination with triazine scavengers, can enhance their effectiveness in removing H 2 S.
- a synergistic effect may be achieved.
- the enhancement achieved is superior to that achieved with quaternary ammonium compounds known in the prior art.
- amine oxides effective to enhance scavenging can also be compatible or miscible with the triazine scavenger, especially in aqueous preparations or conditions, so that a corresponding mixture composition can be conveniently stored and used without difficulties of settling or separation.
- the present invention provides a method according to claim 1 of treating a fluid to reduce the level of H 2 S therein, comprising introducing into the fluid a triazine H 2 S scavenger compound and an amine oxide.
- the amine oxide can be effective to enhance the scavenging effect of the triazine scavenger, preferably synergistically.
- a further aspect is the use according to claim 11 of an amine oxide to enhance the H 2 S scavenging effect of a triazine H 2 S scavenger, in a method in which the H 2 S scavenger and amine oxide are introduced into a fluid in which the H 2 S content is to be reduced.
- a further aspect of the present invention is a scavenger composition according to claim 7 comprising a triazine H 2 S scavenger in combination with amine oxide.
- the amine oxide and triazine derivative are fully miscible in the mixture.
- the mixture is a fully-miscible aqueous preparation, such as a clear solution.
- Amine oxide surface active (surfactant) compounds are readily commercially available. Being substantially nonionic compounds, they can have an advantage relative to quaternary ammonium cationic surfactants (e.g. as proposed in US5744024 ) of lower sensitivity to the presence of other ions in solution. Also they are likely to have lower aquatic toxicity.
- the combination of triazine scavenger and amine oxide is brought into contact with a body of liquid and/or gas containing hydrogen sulfide to be reduced or removed.
- the liquid or gas body may be a static body or a flowing stream. It may comprise or consist of petroleum, petroleum product, natural gas, liquefied petroleum gas or other type of oil fraction or refined oil.
- the fluid body or stream may comprise water, such as underground water or sea water involved in a hydrocarbon recovery process such as oil drilling.
- the point at which the scavenger combination is introduced into the fluid may be determined in accordance with conventional practice, While an enhancement effect may still be achieved by introducing the triazine scavenger and the amine oxide separately, it is preferred to use and introduce them as a mixture as described herein.
- Triazine scavengers are well known. According to the aspects the triazine scavengers are compounds of the formula wherein each R is a substituted or unsubstituted hydrocarbon radical, desirably selected from
- R groups are the same, since such compounds are readily synthesised and commercially available.
- Particularly preferred compounds are those in which R is -CH 2 CH 2 OH or -CH 3 .
- the suitable amine oxides may be selected from various readily-available surface active tertiary amine oxides. This class of compounds is well known to the skilled person in the field of nonionic surfactants.
- R 1 R 2 R 3 N-O in which R 1 is a long chain structure described below and R 2 and R 3 are desirably selected independently from C 1-4 optionally substituted hydrocarbon, preferably alkyl, more preferably methyl, ethyl or 2-hydroxyethyl.
- R 2 and R 3 may be divalent hydrocarbon groups, optionally interrupted by heteroatom, which join to form a ring in combination with the N atom, e.g. a morpholino ring. Additionally it is possible that one or both of R 2 and R 3 may be a divalent group, e.g. alkylene, connecting to the N atom of a further amine oxide moiety. On said further amine oxide moiety the other groups on N be selected freely from the options given here for R 2 , R 3 and R 1 .
- Optional substituents above include any of halogen, hydroxyl and amino.
- R 1 in the above formula is a lipophilic group with a long chain structure, as is well known. Typically it contains from 6 to 24 carbons, more preferably up to 18 carbon atoms. As is also well known, the moieties R 1 in a single composition may represent a range of different length long-chain groups corresponding to those in naturally occurring fats and oils, such as coconut oil or tallow. It is usually preferable in the present invention to avoid substantial proportions of very long 10 chain moieties (e.g. C 16 and above), because the shorter- chain molecules tend give a better aqueous solubility or miscibility with the triazine compound.
- very long 10 chain moieties e.g. C 16 and above
- Preferred amine oxides are those in which R 2 and R 3 are both methyl groups or are both 2-hydroxyethyl groups.
- Preferred amine oxides are liquid at room temperature (20°C).
- the preferred amine oxides are fully water-soluble at 20°C, more preferably at 15°C, 10°C or 5°C, up to at least 10 wt% concentration.
- the mixture composition according to the invention is desirably stable i.e. without separation of the amine oxide or triazine, at 15°C, more preferably at 10°C, more preferably at 5°C.
- the amine oxide is used at at least 0.2 parts, usually from 0.5 to 100 parts, more preferably 1 to 50 parts, still more preferably 1 to 30, 2 to 20 or 2 to 10 parts by weight relative to 100 parts of triazine compound. These preferred proportions also apply when the two components are present in a mixture. Upper and lower limits are of course independent, having distinct technical criteria.
- the mixture may sometimes consist effectively of only the mentioned active ingredients, but usually it comprises one or more additional solvents.
- the solvent is or includes water. It may be a mixture of water and water-miscible organic solvent, e.g. C 1-4 alcohol. This solvent component of the mixture may derive from solvent present in one or both of the triazine and amine oxide compositions as originally supplied. Or, additional solvent may be added to facilitate formation of a fully dissolved mixture, or to facilitate introduction of the mixture into the system to be treated.
- the mixture is a clear solution at 25°C.
- amine oxide surfactants which are effective to enhance the scavenger capability of triazine compounds can be selected to be fully miscible in a clear solution with relevant triazine compounds, leading to great convenience in handling the mixture and in ensuring that it is deployed with the intended ratio between the triazine and amine oxide components.
- the method may use and the mixture may contain more than one different amine oxide compound and /or more than one different triazine compound, within the principles of the present invention. However in many cases a mixture of a single one of each is effective, and convenient to prepare.
- one or more additional components may be administered at the same time and/or included in the mixture according to the invention.
- This may be for example a corrosion inhibitor or the like, subject to effectiveness and compatibility in the system.
- routine testing at room temperature can readily confirm the mutual compatibility of the contemplated triazine and amine oxide components and any other components/solvents intended to be combined.
- a room temperature test is usually valid because one virtue of the compatible mixture is the predetermined ratio of the main components, and this advantage can be exploited provided that the mixture components remain fully mixed (in solution) at least up until they enter the fluid system for reaction.
- a more stringent test e.g. at 10°C or 5°C may be applied.
- a typical amount is in the range from 1 or 2 to 50 ppm of mixture per 1 ppm of H 2 S.
- Amine oxide surfactants and comparative quaternary ammonium cationic surfactants were tested to assess their compatibility and their ability to enhance the H 2 S -scavenging effect of a triazine scavenger.
- the triazine scavenger used was 1,3,5-tri(2-hydroxyethyl]-hexahydro-1,3,5-triazine, provided as a 50% aqueous solution (HR-2510 from MI Swaco).
- the test procedure assessed the ability of the scavenger combinations to reduce H 2 S in a mixed seawater/oil phase medium in the laboratory.
- a 1000 ml vessel was filled with seawater/oil phase (70:30).
- the oil phase used in the experiment was a de-aromatised hydrocarbon fluid (Exxsol139 D80). Carbon dioxide was bubbled through the mixture until the pH reached below 5.0. This took about 10 minutes, Sodium sulfide (Na 2 S) solution was added to develop H 2 S gas. The H 2 S level was measured in the gas space in a conventional way (Drager Pac® III S electronic gas monitor). When a stable level of H 2 S gas was reached the test scavenger composition was added and the H 2 S level in ppm was recorded over a 5 minute period.
- the recommended dosing rate for this particular triazine is from 4 to 20 ppm solution for each ppm of H 2 S in the system.
- the present experiments used a value near the bottom of the recommended range: 5 ppm triazine solution per 1 ppm of H 2 S.
- test surfactants are commercial products, provided as compositions including a diluent.
- triazine solution : (surfactant composition) ratio was always 95:5 by weight.
- the measured enhancement effects were then corrected in proportion to the percentage of active ingredient in the surfactant composition, to provide a comparison of enhancement activities.
- test surfactants were the following.
- Cocobis(2-hydroxyethyl) amine oxide (“Aromox® C/12-W” from Akzo Nobel, 31 wt% in water, C 8 5%, C 10 6%, C 12 50%, C 14 19%, C 16 10%, C 18 10%).
- the compatibilities were as follows. Amine oxide 1 compatible, clear solution Amine oxide 2 compatible, clear solution Amine oxide 3 compatible, clear solution Quaternary 1 not compatible at 20°C or 60°. Heated to 60°C for several hours and mixed for testing, but still not compatible. Quaternary 2 compatible, clear solution
- Table 1 shows the measured data, firstly for three reference runs using the aqueous triazine scavenger HR-2510 by itself, and then with two runs using the 95:5 mixture thereof with Amine Oxide 1.
- Table 1 Time (min) Triazine (Run 1) Triazine (Run 2) Triazine (Run 3) + Amine Oxide 1 (Run 1) + Amine Oxide 1 (Run 2) 0.0 94 71 98 98 80 0.5 46 36 32 42 35 1.0 14 12 10 2 9 1.5 11 13 12 0 8 2.0 16 20 15 0 11 2.5 18 22 17 2 13 3.0 20 23 18 4 14 3.5 21 24 19 6 15 4.0 22 24 20 a 15 4.5 21 23 20 10 15 5.0 24 22 20 12 15
- Table 2 shows corresponding data for Amine Oxides 2 and 3.
- the amine oxide surfactants were effective to enhance the H 2 S -scavenging effect of the triazine scavenger. Moreover they were more effective in this respect than either of the cationic ammonium surfactants. Additionally, they were fully compatible with the triazine to make an easily-handled mixture.
- Quaternary 1 used in the above-mentioned US 5744024 , is not compatible at all and is therefore not convenient for practical use, although it did show a rapid enhancement effect as suggested in US 5744024 .
- the other cationic surfactant, Quaternary 2 was compatible and produced a clear solution mixture, but its enhancement activity was markedly lower than the amine oxide enhancers.
- the present invention provides a useful and unexpectedly effective addition to the range of means available to the skilled person for reducing hydrogen sulfide using a scavenge process.
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Description
- This invention has to do with methods and compositions for the treatment of fluids to remove or reduce hydrogen sulfide.
- In the oil and gas industries, it is well known to treat fluid bodies and fluid streams with scavengers to remove hydrogen sulfide (H2S). H2S is often present in processes involving the recovery, production or handling of hydrocarbons such as petroleum, petroleum gas and their derivatives. The H2S may be present not only in or above the hydrocarbon fluid but also in associated water, e.g. in sea water or underground water mixed with the hydrocarbon.
- The acidity and toxicity of H2S necessitate its reduction to low levels. To remove it, various processes are known and one of these is to treat the fluid or fluids concerned with a scavenger substance which reacts selectively with the H2S. A wide range of scavenger compounds is known for this purpose. One group of compounds of established effectiveness is the 1, 3, 5-tri-substituted hexahydrotriazines. The use of such triazine scavengers is disclosed in for example
US 5128049 andUS574 4024 . - Because the use of triazine derivative scavengers is a non-regenerable process, i.e. the scavengers are consumed in the process, it is desirable to maximise the effectiveness of the scavenger in removing H2S in order to minimise the cost of the procedure. It is also in any case generally desirable to improve or enhance the effectiveness of triazine derivative scavengers in removing H2S.
- In
US5744024 , a triazine derivative scavenger is disclosed to be used in combination with a quaternary ammonium compound to enhance its scavenging ability. -
US7264786 describes scavenging, especially for mercaptans in addition to H2S, using triazine derivatives substituted with tertiary amino groups, morpholines, piperazines, alkanolamines, amine oxides or polyamines. - The aim herein is to provide new and useful methods and compositions for scavenging H2S from fluid bodies or fluid streams, such as those mentioned above, using a triazine scavenger. A particular aspect is to combine the triazine scavenger with an auxiliary substance to enhance its effectiveness, and desirably in a synergistic manner.
- A further object or aspect of the invention is the provision of a composition comprising a triazine scavenger in admixture with a said auxiliary substance, preferably as a compatible (miscible) mixture, which can be introduced or injected as a mixture into the fluid to be treated to provide a convenient process with an appropriate predetermined ratio of the scavenger and auxiliary enhancer.
- The present inventors have discovered that amine oxides, used in combination with triazine scavengers, can enhance their effectiveness in removing H2S. A synergistic effect may be achieved. In embodiments, the enhancement achieved is superior to that achieved with quaternary ammonium compounds known in the prior art. Moreover we have found that amine oxides effective to enhance scavenging can also be compatible or miscible with the triazine scavenger, especially in aqueous preparations or conditions, so that a corresponding mixture composition can be conveniently stored and used without difficulties of settling or separation.
- Thus, in a first aspect the present invention provides a method according to claim 1 of treating a fluid to reduce the level of H2S therein, comprising introducing into the fluid a triazine H2S scavenger compound and an amine oxide. The amine oxide can be effective to enhance the scavenging effect of the triazine scavenger, preferably synergistically.
- A further aspect is the use according to claim 11 of an amine oxide to enhance the H2S scavenging effect of a triazine H2S scavenger, in a method in which the H2S scavenger and amine oxide are introduced into a fluid in which the H2S content is to be reduced.
- A further aspect of the present invention is a scavenger composition according to claim 7 comprising a triazine H2S scavenger in combination with amine oxide. In preferred embodiments the amine oxide and triazine derivative are fully miscible in the mixture. Desirably the mixture is a fully-miscible aqueous preparation, such as a clear solution.
- Amine oxide surface active (surfactant) compounds are readily commercially available. Being substantially nonionic compounds, they can have an advantage relative to quaternary ammonium cationic surfactants (e.g. as proposed in
US5744024 ) of lower sensitivity to the presence of other ions in solution. Also they are likely to have lower aquatic toxicity. - In the methods of the invention, the combination of triazine scavenger and amine oxide is brought into contact with a body of liquid and/or gas containing hydrogen sulfide to be reduced or removed. The liquid or gas body may be a static body or a flowing stream. It may comprise or consist of petroleum, petroleum product, natural gas, liquefied petroleum gas or other type of oil fraction or refined oil. Moreover the fluid body or stream may comprise water, such as underground water or sea water involved in a hydrocarbon recovery process such as oil drilling.
- The point at which the scavenger combination is introduced into the fluid may be determined in accordance with conventional practice, While an enhancement effect may still be achieved by introducing the triazine scavenger and the amine oxide separately, it is preferred to use and introduce them as a mixture as described herein.
-
- C1-4 hydrocarbon, preferably alkyl, more preferably methyl or ethyl;
- C1-6 hydroxy-substituted or amino-substituted alkyl, preferably -CH2CH2OH;
- alkoxy-substituted hydrocarbon, preferably with C1-6 alkoxy substituted on C1-6 alkyl.
- Preferably all three R groups are the same, since such compounds are readily synthesised and commercially available. Particularly preferred compounds are those in which R is -CH2CH2OH or -CH3.
- These compounds are commercially available, either substantially pure or as solutions, and especially aqueous solutions are convenient and preferred, e.g. at 30 to 80 wt% concentration.
- The suitable amine oxides may be selected from various readily-available surface active tertiary amine oxides. This class of compounds is well known to the skilled person in the field of nonionic surfactants.
- Typically they accord with the conventional formula
R1R2R3N-O
in which R1 is a long chain structure described below and R2 and R3 are desirably selected independently from C1-4 optionally substituted hydrocarbon, preferably alkyl, more preferably methyl, ethyl or 2-hydroxyethyl. - Alternatively R2 and R3 may be divalent hydrocarbon groups, optionally interrupted by heteroatom, which join to form a ring in combination with the N atom, e.g. a morpholino ring. Additionally it is possible that one or both of R2 and R3 may be a divalent group, e.g. alkylene, connecting to the N atom of a further amine oxide moiety. On said further amine oxide moiety the other groups on N be selected freely from the options given here for R2, R3 and R1. Optional substituents above include any of halogen, hydroxyl and amino.
- R1 in the above formula is a lipophilic group with a long chain structure, as is well known. Typically it contains from 6 to 24 carbons, more preferably up to 18 carbon atoms. As is also well known, the moieties R1 in a single composition may represent a range of different length long-chain groups corresponding to those in naturally occurring fats and oils, such as coconut oil or tallow. It is usually preferable in the present invention to avoid substantial proportions of very long 10 chain moieties (e.g. C16 and above), because the shorter- chain molecules tend give a better aqueous solubility or miscibility with the triazine compound.
- Preferred amine oxides are those in which R2 and R3 are both methyl groups or are both 2-hydroxyethyl groups. Preferred amine oxides are liquid at room temperature (20°C). Usually the preferred amine oxides are fully water-soluble at 20°C, more preferably at 15°C, 10°C or 5°C, up to at least 10 wt% concentration. Moreover the mixture composition according to the invention is desirably stable i.e. without separation of the amine oxide or triazine, at 15°C, more preferably at 10°C, more preferably at 5°C.
- This is of practical importance in providing a mixture that is compositionally stable even after storage or delivery under cold conditions.
- Desirably the amine oxide is used at at least 0.2 parts, usually from 0.5 to 100 parts, more preferably 1 to 50 parts, still more preferably 1 to 30, 2 to 20 or 2 to 10 parts by weight relative to 100 parts of triazine compound. These preferred proportions also apply when the two components are present in a mixture. Upper and lower limits are of course independent, having distinct technical criteria.
- The mixture may sometimes consist effectively of only the mentioned active ingredients, but usually it comprises one or more additional solvents. Preferably, the solvent is or includes water. It may be a mixture of water and water-miscible organic solvent, e.g. C1-4 alcohol. This solvent component of the mixture may derive from solvent present in one or both of the triazine and amine oxide compositions as originally supplied. Or, additional solvent may be added to facilitate formation of a fully dissolved mixture, or to facilitate introduction of the mixture into the system to be treated.
- Desirably the mixture is a clear solution at 25°C. We have found that, conveniently, readily-available amine oxide surfactants which are effective to enhance the scavenger capability of triazine compounds can be selected to be fully miscible in a clear solution with relevant triazine compounds, leading to great convenience in handling the mixture and in ensuring that it is deployed with the intended ratio between the triazine and amine oxide components.
- It will be appreciated that the method may use and the mixture may contain more than one different amine oxide compound and /or more than one different triazine compound, within the principles of the present invention. However in many cases a mixture of a single one of each is effective, and convenient to prepare.
- According to the nature of the fluid to be treated with the scavenger combination, and the type of apparatus or apparatus stage in which the scavenger treatment is to be carried out, one or more additional components may be administered at the same time and/or included in the mixture according to the invention. This may be for example a corrosion inhibitor or the like, subject to effectiveness and compatibility in the system.
- In general, routine testing at room temperature can readily confirm the mutual compatibility of the contemplated triazine and amine oxide components and any other components/solvents intended to be combined. A room temperature test is usually valid because one virtue of the compatible mixture is the predetermined ratio of the main components, and this advantage can be exploited provided that the mixture components remain fully mixed (in solution) at least up until they enter the fluid system for reaction. However a more stringent test e.g. at 10°C or 5°C may be applied.
- As regards the overall amount to be used for the scavenging treatment, the skilled person can follow conventional practice regarding the triazine compound used, while expecting to be able to use somewhat less in view of the enhancing effect of the amine oxide additive. A typical amount is in the range from 1 or 2 to 50 ppm of mixture per 1 ppm of H2S.
- Amine oxide surfactants and comparative quaternary ammonium cationic surfactants were tested to assess their compatibility and their ability to enhance the H2S -scavenging effect of a triazine scavenger.
- The triazine scavenger used was 1,3,5-tri(2-hydroxyethyl]-hexahydro-1,3,5-triazine, provided as a 50% aqueous solution (HR-2510 from MI Swaco). The test procedure assessed the ability of the scavenger combinations to reduce H2S in a mixed seawater/oil phase medium in the laboratory.
- A 1000 ml vessel was filled with seawater/oil phase (70:30). The oil phase used in the experiment was a de-aromatised hydrocarbon fluid (Exxsol139 D80). Carbon dioxide was bubbled through the mixture until the pH reached below 5.0. This took about 10 minutes, Sodium sulfide (Na2S) solution was added to develop H2S gas. The H2S level was measured in the gas space in a conventional way (Drager Pac® III S electronic gas monitor). When a stable level of H2S gas was reached the test scavenger composition was added and the H2S level in ppm was recorded over a 5 minute period.
- For most purposes, the recommended dosing rate for this particular triazine is from 4 to 20 ppm solution for each ppm of H2S in the system. In order to give scope for showing any enhancement, i.e. to avoid saturating the effect, the present experiments used a value near the bottom of the recommended range: 5 ppm triazine solution per 1 ppm of H2S.
- The test surfactants are commercial products, provided as compositions including a diluent. In the experiments the triazine solution : (surfactant composition) ratio was always 95:5 by weight. The measured enhancement effects were then corrected in proportion to the percentage of active ingredient in the surfactant composition, to provide a comparison of enhancement activities.
- The test surfactants were the following.
- C12-18 alkyldimethylamine oxide ("Aromox® B-W 500" from Akzo Nobel, 30 wt% in water, C12 35%, C14 14 %, C16-C18 50%).
- Cocobis(2-hydroxyethyl) amine oxide ("Aromox® C/12-W" from Akzo Nobel, 31 wt% in water, C8 5%, C10 6%, C12 50%, C14 19%, C16 10%, C18 10%).
- Tetradecyldimethylamine oxide ("Aromox®" 14 D-W 970" from Akzo Nobel, 25% in water, C14 97%).
- Di(hydrogenated tallow)dimethylammonium chloride ("Arquad 2HT-75" from Akzo Nobel, 75wt % in isopropanol/water), as used in examples of
US5744024 . - Mono (hydrogenated tallow) trimethylammonium chloride ("Arquad T-50 HFP" from Akzo Nobel, 50% in isopropanol/water).
- In the test mixtures at 95:5, the compatibilities were as follows.
Amine oxide 1 compatible, clear solution Amine oxide 2 compatible, clear solution Amine oxide 3 compatible, clear solution Quaternary 1 not compatible at 20°C or 60°. Heated to 60°C for several hours and mixed for testing, but still not compatible. Quaternary 2 compatible, clear solution - Table 1 shows the measured data, firstly for three reference runs using the aqueous triazine scavenger HR-2510 by itself, and then with two runs using the 95:5 mixture thereof with Amine Oxide 1.
Table 1 Time (min) Triazine (Run 1) Triazine (Run 2) Triazine (Run 3) + Amine Oxide 1 (Run 1) + Amine Oxide 1 (Run 2) 0.0 94 71 98 98 80 0.5 46 36 32 42 35 1.0 14 12 10 2 9 1.5 11 13 12 0 8 2.0 16 20 15 0 11 2.5 18 22 17 2 13 3.0 20 23 18 4 14 3.5 21 24 19 6 15 4.0 22 24 20 a 15 4.5 21 23 20 10 15 5.0 24 22 20 12 15 Table 2 Time (min) + Amine Oxide 2 (Run 1) + Amine Oxide 2 (Run 2) + Amine Oxide 3 (Run 1) + Amine Oxide 3 (Run 2) 0.0 98 98 97 98 0.5 48 39 46 52 1.0 8 6 10 11 1.5 5 5 4 6 2.0 9 8 6 8 2.5 11 9 9 9 3.0 12 9 10 12 3.5 13 10 12 13 4.0 13 10 13 15 4.5 13 9 13 15 5.0 13 9 13 16 Table 3 Time (min) + Quaternary 1 (Run 1) + Quaternary 1 (Run 2) + Quaternary 2 (Run 1) + Quaternary 2 (Run 2) 0.0 82 89 98 97 0.5 51 39 57 2 8 1.0 2 0 22 6 1.5 0 0 15 6 2.0 2 0 13 8 2.5 6 1 14 9 3.0 10 3 14 9 3.5 12 5 15 9 4.0 15 7 15 9 4.5 16 8 15 8 5.0 17 10 15 8 - These data were then corrected, taking account of the percentage of active fraction in the surfactant compositions, and compared against the data for HR-2510 alone to give the comparative data as set out in the following Table 4.
Table 4 Test Surfactant Delta ppm Active Fraction Corrected Delta ppm Time to max difference Amine Oxide 1 10.8 0.30 36.0 3.5 Amine Oxide 2 11.0 0.30 35.5 5 Amine Oxide 3 7.5 0.25 30.0 3 Quaternary 1 16.0 0.75 21.3 2 Quaternary 2 10.5 0.50 21.0 5 - In the above Table 4:
- "delta ppm" is the maximum difference (improvement in H2S reduction) achieved by the triazine/surfactant mixture relative to the triazine alone;
- "active fraction" is the proportion of surfactant in the surfactant composition used;
- "corrected delta ppm" is the delta ppm value adjusted proportionately to the active fraction, to indicate an expected delta ppm at equal surfactant levels;
- "time to max difference" is the time taken in minutes to reach the maximum enhancement (i.e. the maximum difference between values with the triazine/surfactant combination and triazine alone).
- It can be seen from the results that the amine oxide surfactants were effective to enhance the H2S -scavenging effect of the triazine scavenger. Moreover they were more effective in this respect than either of the cationic ammonium surfactants. Additionally, they were fully compatible with the triazine to make an easily-handled mixture.
- Quaternary 1, used in the above-mentioned
US 5744024 , is not compatible at all and is therefore not convenient for practical use, although it did show a rapid enhancement effect as suggested inUS 5744024 . The other cationic surfactant, Quaternary 2, was compatible and produced a clear solution mixture, but its enhancement activity was markedly lower than the amine oxide enhancers. - Accordingly, the present invention provides a useful and unexpectedly effective addition to the range of means available to the skilled person for reducing hydrogen sulfide using a scavenge process.
Claims (14)
- A method of treating a fluid to reduce the level of H2S therein, comprising introducing into the fluid a triazine scavenger compound and an amine oxide, in which the triazine scavenger compound and the amine oxide are provided as a mixture which is introduced into said fluid, in which the triazine scavenger is a compound of the formula
C1-4 hydrocarbon radicals, C1-6 hydroxy-substituted or amino-substituted alkyls, and alkoxy-substituted hydrocarbon radicals. - The method of claim 1 in which R is -CH2CH2OH or -CH3.
- The method of claim 1 or 2 in which the amine oxide accords with the formula
R1R2R3N→O
in which R1 is a lipophilic group with a long chain structure having from 6 to 24 carbons, and R2 and R3 are selected independently from C1-4 optionally substituted hydrocarbon groups (provided that one or both of R2 and R3 may be a divalent group connecting to the N atom of a further amine oxide moiety in which said further amine oxide moiety the other substituents on NI may be selected from the options given here for R2, R3 and R1), or R2 and R3 are divalent hydrocarbon groups, optionally interrupted by heteroatom, which join to form a ring in combination with the N atom, - The method of any one of the preceding claims in which both R2 and R3 are methyl, ethyl or 2- hydroxyethyl and R1 is alkyl of from 6 to 18 carbon atoms.
- The method of claim 1 in which said mixture is a compatible aqueous mixture of the triazine scavenger compound and amine oxide.
- The method of any one of the preceding claims in which the triazine scavenger compound and amine oxide are used at a ratio of from 0.5 to 20 parts by weight amine oxide to 100 parts by weight of triazine.
- A scavenger composition comprising a mixture of triazine H2S scavenger with amine oxide in which the triazine H2S scavenger is a compound of the formula
C1-4 hydrocarbon radicals, C1-6 hydroxy-substituted or amino-substituted alkyls, and alkoxy-substituted hydrocarbon radicals. - The scavenger composition of claim 7 in which R is -CH2CH2OH or -CH3.
- The scavenger composition of claim 7 or 8 in which the amine oxide accords with the formula
R1R2R3N→O
in which R1 is a lipophilic group with a long chain structure having from 6 to 24 carbons, and R2 and R3 are selected independently from C1-4 optionally substituted hydrocarbon groups (provided that one or both of R2 and R3 may be a divalent group connecting to the N atom of a further amine oxide moiety in which said further amine oxide moiety the other substituents on NI may be selected from the options given here for R2, R3 and R1), or R2 and R3 are divalent hydrocarbon groups, optionally interrupted by heteroatom, which join to form a ring in combination with the N atom, preferably in which both R2 and R3 are methyl, ethyl or 2- hydroxyethyl and R1 is alkyl of from 6 to 18 carbon atoms. - The scavenger composition of claim 7, 8 or 9 in which said mixture is a compatible aqueous mixture of the triazine scavenger compound and amine oxide and/or in which the triazine scavenger compound and amine oxide are used at a ratio of from 0.5 to 20 parts by weight amine oxide to 100 parts by weight of triazine.
- A use of an amine oxide to enhance the H2S scavenging effect of a triazine H2S scavenger, in a method in which the H2S scavenger and amine oxide are introduced as a mixture into a fluid in which the H2S content is to be reduced, in which the triazine scavenger is a compound of the formula
C1-4 hydrocarbon radicals, C1-6 hydroxy-substituted or amino-substituted alkyls, and alkoxy-substituted hydrocarbon radicals. - The use of claim 11 in which R is -CH2CH2OH or -CH3.
- The use of claim 11 or 12 in which the amine oxide accords with the formula
R1R2R3N→O
in which R1 is a lipophilic group with a long chain structure having from 6 to 24 carbons, and R2 and R3 are selected independently from C1-4 optionally substituted hydrocarbon groups (provided that one or both of R2 and R3 may be a divalent group connecting to the N atom of a further amine oxide moiety in which said further amine oxide moiety the other substituents on NI may be selected from the options given here for R2, R3 and R1), or R2 and R3 are divalent hydrocarbon groups, optionally interrupted by heteroatom, which join to form a ring in combination with the N atom, preferably in which both R2 and R3 are methyl, ethyl or 2- hydroxyethyl and R1 is alkyl of from 6 to 18 carbon atoms. - The use according to claim 11, 12, or 13 in which said mixture is a compatible aqueous mixture of the triazine scavenger compound and amine oxide and/or in which the triazine scavenger compound and amine oxide are used at a ratio of from 0.5 to 20 parts by weight amine oxide to 100 parts by weight of triazine.
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PCT/IB2010/002234 WO2010150107A1 (en) | 2009-06-26 | 2010-06-28 | Scavenger compositions and their use |
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US20120012506A1 (en) * | 2010-07-14 | 2012-01-19 | Compton Dennis R | Method of removing hydrogen sulfide |
FR3005964B1 (en) | 2013-05-27 | 2016-06-24 | Ceca Sa | STORAGE-FREE CORROSION FORMULATIONS |
CN103463945B (en) * | 2013-09-25 | 2015-06-17 | 天津亿利科能源科技发展股份有限公司 | Remover and removal method for sulfuretted hydrogen in low-water cut crude oil associated gas |
RU2017129912A (en) * | 2015-03-10 | 2019-04-10 | Зе Лубризол Корпорейшн | ENSURING ANTI-FREEZING COMPOSITIONS FOR SULFUR ABSORBERS AND METHODS FOR PRODUCING AND USING THEREOF |
DK3283600T3 (en) * | 2015-04-16 | 2020-01-02 | Dow Global Technologies Llc | PROCEDURE FOR REDUCING HYDROGEN SULFIDE LEVELS IN LIQUID OR GASFUL CURRENTS USING COMPOSITIONS CONTAINING TRIAZINES AND ANIONIC SURFACTURING SUBSTANCES |
DK3400089T3 (en) * | 2016-01-08 | 2022-11-21 | Ecolab Usa Inc | MULTIFUNCTIONAL PRODUCT WITH HYDROGEN SULFIDE REMOVAL AND HYDRATE INHIBITING CAPACITY |
WO2018001630A1 (en) * | 2016-07-01 | 2018-01-04 | Clariant International Ltd | Synergized acetals composition and method for scavenging sulfides and mercaptans |
EP3578622B1 (en) | 2016-07-01 | 2020-10-07 | Clariant International Ltd | Synergized acetals composition and method for scavenging sulfides and mercaptans |
US20190194551A1 (en) | 2017-12-22 | 2019-06-27 | Clariant International, Ltd. | Synergized acetals composition and method for scavenging sulfides and mercaptans |
US11555140B2 (en) | 2017-12-22 | 2023-01-17 | Clariant International Ltd | Synergized hemiacetals composition and method for scavenging sulfides and mercaptans |
GB201813648D0 (en) * | 2018-08-22 | 2018-10-03 | Innospec Ltd | Methods, products & uses relating thereto |
CN113599990B (en) * | 2021-07-13 | 2024-02-27 | 克拉玛依市杰德科技有限责任公司 | Anhydrous desulfurizing agent and application thereof |
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US5128049A (en) | 1991-01-22 | 1992-07-07 | Gatlin Larry W | Hydrogen sulfide removal process |
US5744024A (en) | 1995-10-12 | 1998-04-28 | Nalco/Exxon Energy Chemicals, L.P. | Method of treating sour gas and liquid hydrocarbon |
US5922794A (en) * | 1997-03-26 | 1999-07-13 | General Electric Company | Compositions stabilized with tertiary amine oxides |
US6063346A (en) * | 1998-06-05 | 2000-05-16 | Intevep, S. A. | Process for scavenging hydrogen sulfide and mercaptan contaminants from a fluid |
US7264786B2 (en) * | 2004-04-21 | 2007-09-04 | Bj Services Company | Method of scavenging hydrogen sulfide and/or mercaptans from fluid and gas streams |
US7491682B2 (en) * | 2004-12-15 | 2009-02-17 | Bj Services Company | Method of inhibiting or controlling formation of inorganic scales |
US8596364B2 (en) * | 2007-04-03 | 2013-12-03 | M-I Llc | Process for preventing or remediating trithiazine deposition in high H2S wells |
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